AP STATS 2022 EXAM
DEFINITIONS/CONCEPTS
z-score –
how many standard deviations away from the mean
normal model –
unimodal and symmetric
empirical rules 1SD = x%, 2SD = x%, 3SD = x% - 68%, 95%, 99.5%
form –
layout/underlying pattern
relationship –
strong means follows pattern, weak means scattered
veriable of interest and explanatory/predictor variable –
var of int = y var/response var, explan var = x var
correlation coefficient –
a measure of the strength of relationship between two variables
lurking variable –
a variable that is not among the explanatory or response variables in a study but
that may influence the response variable
parameters –
statistics from a whole population
statistics –
mead/med/mode for a sample
line of best fit –
the line for which the sum of the squared residuals is smallest
good regressions model means –
when plot residuals (x vs y or predicted y vs y) there is no shape
equal variance assumption –
a good model will have the spread of the residuals consistent throuhgout and no
shape
DEFINITIONS/CONCEPTS
z-score –
how many standard deviations away from the mean
normal model –
unimodal and symmetric
empirical rules 1SD = x%, 2SD = x%, 3SD = x% - 68%, 95%, 99.5%
form –
layout/underlying pattern
relationship –
strong means follows pattern, weak means scattered
veriable of interest and explanatory/predictor variable –
var of int = y var/response var, explan var = x var
correlation coefficient –
a measure of the strength of relationship between two variables
lurking variable –
a variable that is not among the explanatory or response variables in a study but
that may influence the response variable
parameters –
statistics from a whole population
statistics –
mead/med/mode for a sample
line of best fit –
the line for which the sum of the squared residuals is smallest
good regressions model means –
when plot residuals (x vs y or predicted y vs y) there is no shape
equal variance assumption –
a good model will have the spread of the residuals consistent throuhgout and no
shape
